handlebars

https://github.com/sunng87/handlebars-rust

Handlebars templating language implemented in Rust and for Rust.

quickjs

https://github.com/theduke/quickjs-rs
https://bellard.org/quickjs/ - QuickJS Javascript Engine
https://github.com/bellard/quickjs

QuickJS is a new, small Javascript engine by Fabrice Bellard and Charlie Gordon. It is fast and supports the full ES2020 specification.

rhai

https://github.com/jonathandturner/rhai

Rhai is an embedded scripting language and evaluation engine for Rust that gives a safe and easy way to add scripting to any application.

rune

https://github.com/rune-rs/rune

An embeddable dynamic programming language for Rust.

https://arewegameyet.rs/ecosystem/scripting/ - Scripting languages embeddable in a Rust game